PNNL

Abstract

Time-dependent and dose-dependent properties of SiC-composites include retained strength, dimensional stability, and creep-crack growth [1], which have been partly addressed by a dynamic crack growth model developed to predict composite lifetimes due to growth of internal cracks in these materials [2-4]. However, crack growth models have not been able to include dose-dependent swelling data until the development of a modified four-cylinder model [5]. The synthesis of these models will provide a more detailed understanding and improved predictive capabilities with respect to time-dependent mechanical properties of SiC-composites under neutron irradiation.